Double telescopic davit lifeboat davit

Abstract

The application discloses a double telescopic boom type lifeboat hoisting device, which comprises two symmetrically arranged telescopic booms, one end of each telescopic boom is connected with the side of a drilling platform / drilling ship, a lifting steel wire rope is arranged on each telescopic boom, one end of the lifting steel wire rope is connected with a lifting winch, the lifting winch is arranged on the drilling platform / drilling ship, and the other end of the lifting steel wire rope is connected with the end of the telescopic boom away from the drilling platform / drilling ship through a lifting pulley. The application solves the problems of the existing single telescopic boom type lifeboat hoisting device or double swing arm type lifeboat hoisting device of the drilling platform / drilling ship, such as small hoisting load, short hoisting distance, collision between the lifeboat and the drilling platform / drilling ship or hoisting obstacle when the drilling platform / drilling ship is in a large-angle inclination due to sea disaster or in a severe sea condition.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of offshore oil rescue device, and relates to a double telescopic boom type lifeboat hoisting device. BACKGROUND

[0002] With the increasing progress of offshore oil drilling and exploitation technology and the continuous increase of offshore oil drilling demand, offshore oil drilling equipment is increasingly widely applied, and the drilling equipment has developed from the original small and single-function shallow sea equipment to the current large, super large and multi-function deep sea drilling equipment. As a result, the supporting equipment on the drilling platform / drilling ship is more complex and diverse, and the number of operating personnel has increased from dozens to hundreds. The traditional small and medium-sized lifeboat cannot meet the use requirements and supporting needs of the operating personnel on the large drilling platform / drilling ship in life-saving escape. Increasing the number of lifeboats not only occupies a large amount of drilling platform / drilling ship operating space, but also greatly increases the procurement and maintenance costs and improves the operation difficulty. Therefore, the large heavy-duty lifeboat with more than 100 people can not only reduce the number of supporting lifeboats, save a large amount of installation space, but also greatly reduce the operation difficulty and save the procurement and maintenance costs. At present, the drilling platform / drilling ship mostly uses single telescopic arm type lifeboat hoisting device or double swing arm type lifeboat hoisting device to realize the hoisting and launching of small and medium-sized lifeboats. The hoisting load of the lifeboat hoisting device is small, and the telescopic arm / double swing arm has a short hoisting and launching distance. When the drilling platform / drilling ship tilts at a large angle in a marine accident or in a bad sea condition, the large heavy-duty lifeboat is easily hoisted and launched at a long distance, and the lifeboat is easily collided with the mother ship or obstacles are easily appeared during hoisting and launching, which affects the safety of the personnel in the lifeboat and thus cannot perform the long-distance hoisting and launching operation on the large heavy-duty lifeboat. SUMMARY

[0003] The purpose of the present application is to provide a double telescopic boom type lifeboat hoisting device, which solves the problems of the existing single telescopic arm type lifeboat hoisting device or double swing arm type lifeboat hoisting device on the drilling platform / drilling ship, such as small hoisting load, short hoisting and launching distance, collision between the lifeboat and the mother ship when the drilling platform / drilling ship tilts at a large angle in a marine accident, and obstacles during hoisting and launching in a bad sea condition.

[0004] The technical solution adopted by the present application is a double telescopic boom type lifeboat hoisting device, which comprises two symmetrical telescopic arms. One end of each telescopic arm is connected with the side of the drilling platform / drilling ship. A lifting steel wire rope is arranged on each telescopic arm. One end of the lifting steel wire rope is connected with a lifting winch, and the lifting winch is arranged on the drilling platform / drilling ship. The other end of the lifting steel wire rope is connected with the end of the telescopic arm away from the drilling platform / drilling ship through a lifting pulley.

[0005] The present application is further characterized in that

[0006] Each telescopic boom comprises an outer support frame, one end of which is connected to the side of a drilling platform / drilling ship, and an inner wall of the outer support frame is slidingly connected to a first telescopic arm, and an inner wall of the first telescopic arm is slidingly connected to a second telescopic arm;

[0007] The telescopic hydraulic cylinder is further provided, one end of which is connected to the bottom of the outer support frame, and the other end of which is connected to the bottom of the first telescopic arm.

[0008] The top of the first telescopic arm and away from the drilling platform / drilling ship is provided with an extension wire rope guide wheel, and the extension wire rope is wound around the extension wire rope guide wheel, one end of the extension wire rope is connected to the top of the outer support frame, and the other end of the extension wire rope is connected to the top of the second telescopic arm and close to the drilling platform / drilling ship.

[0009] The top of the first telescopic arm and close to the drilling platform / drilling ship is provided with a retraction wire rope guide wheel, and the retraction wire rope is wound around the retraction wire rope guide wheel, one end of the retraction wire rope is connected to the top of the outer support frame and away from the drilling platform / drilling ship, and the other end of the retraction wire rope is connected to the top of the second telescopic arm and close to the drilling platform / drilling ship.

[0010] One end of the telescopic hydraulic cylinder is connected to the telescopic hydraulic cylinder connecting lug I arranged at the bottom of the outer support frame through a pin shaft, and the other end of the telescopic hydraulic cylinder is connected to the telescopic hydraulic cylinder connecting lug II arranged at the bottom of the first telescopic arm through a pin shaft.

[0011] One end of the extension wire rope is connected to the extension wire rope rope end connecting lug arranged at the top of the outer support frame, and the other end of the extension wire rope is connected to the extension wire rope rope head connecting lug arranged at the top of the second telescopic arm.

[0012] One end of the retraction wire rope is connected to the retraction wire rope rope end connecting lug arranged at the top of the outer support frame, and the other end of the retraction wire rope is connected to the retraction wire rope rope head connecting lug arranged at the top of the second telescopic arm.

[0013] One end of the lifting wire rope is wound around the lifting wire rope guide pulley I arranged at the end of the outer support frame close to the drilling platform / drilling ship and connected to the lifting winch, and the lifting wire rope passes through the outer support frame, the first telescopic arm, and the second telescopic arm in sequence, and the other end of the lifting wire rope is wound around the two lifting wire rope guide pulleys II arranged at the end of the second telescopic arm away from the drilling platform / drilling ship and connected to the lifting wire rope connecting lug, and the lifting wire rope connecting lug is connected to the second telescopic arm.

[0014] The part of the lifting wire rope between the two lifting wire rope guide pulleys II is wound around a lifting pulley, and the bottom of the lifting pulley is provided with a lifting hook.

[0015] The two inner side walls of the outer support frame are provided with sliding grooves I, the two outer side walls of the first telescopic arm are provided with sliding blocks I, the sliding blocks I are arranged in the sliding grooves I, the two inner side walls of the first telescopic arm are provided with sliding grooves II, the two outer side walls of the second telescopic arm are provided with sliding blocks II, and the sliding blocks II are arranged in the sliding grooves II.

[0016] The length direction central axes of the two telescopic arms are perpendicular to the side of the drilling platform / drilling ship.

[0017] The beneficial effect of the present application is that the double telescopic arm type lifeboat davit device meets the requirements of long-distance lifting of large heavy load lifeboats when the drilling platform / drilling ship is in a large angle inclination in a maritime accident and in a severe sea condition, avoids collision between the lifeboat and the drilling platform / drilling ship or lifting obstacles, ensures the safety of the personnel in the lifeboat, reduces the number of lifeboats carried by the large drilling platform / drilling ship, saves a large amount of lifeboat installation space, reduces the operation difficulty of lifeboat lifting, and saves the lifeboat procurement and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a side structure schematic view of the double telescopic arm type lifeboat davit device of the present application;

[0019] Figure 2 is a top view structure schematic view of the double telescopic arm type lifeboat davit device of the present application;

[0020] Figure 3 is Figure 1 is a partial enlarged view of I in the figure;

[0021] Figure 4 is Figure 1 is a partial enlarged view of II in the figure;

[0022] Figure 5 is Figure 2 is a partial enlarged view of III in the figure;

[0023] Figure 6 is Figure 2 is a partial enlarged view of IV in the figure;

[0024] Figure 7 is Figure 5 is the A-A view in the figure;

[0025] Figure 8 is Figure 5 is the B-B view in the figure.

[0026] In the figure, 1. hoisting winch, 2. hoisting wire rope, 3. hoisting wire rope guide pulley I, 4. outer support frame, 5. retraction wire rope rope end connecting lug plate, 6. extension wire rope rope end connecting lug plate, 7. telescopic hydraulic cylinder, 8. telescopic hydraulic cylinder connecting lug plate I, 9. retraction wire rope guide wheel, 10. retraction wire rope, 11. retraction wire rope head connecting lug plate, 12. extension wire rope, 13. extension wire rope guide wheel, 14. extension wire rope head connecting lug plate, 15. primary telescopic arm, 16. telescopic hydraulic cylinder connecting lug plate II, 17. hoisting wire rope connecting lug plate, 18. secondary telescopic arm, 19. hoisting pulley, 20. lifeboat, 21. remote control device, 22. drilling platform / drilling ship, 23. hoisting wire rope guide pulley II. DETAILED DESCRIPTION

[0027] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The present application provides a double telescopic boom type lifeboat hoisting device, as shown in Figure 1 and Figure 2 , comprising two symmetrically arranged telescopic arms, one end of each telescopic arm being connected with the side of the drilling platform / drilling ship 22, the central axes of the length directions of the two telescopic arms being perpendicular to the side of the drilling platform / drilling ship 22, a hoisting wire rope 2 being arranged on each telescopic arm, one end of the hoisting wire rope 2 being connected with a hoisting winch 1, the hoisting winch 1 being arranged on the drilling platform / drilling ship 22, the other end of the hoisting wire rope 2 being connected with the end of the telescopic arm away from the drilling platform / drilling ship 22 through a hoisting pulley 19, the bottom of the hoisting pulley 19 being provided with a hook, the two telescopic arms being respectively used for suspending the hanging points of the bow and the stern of a lifeboat 20; through the synchronous extension and retraction of the two telescopic arms and the lifting of the hoisting pulley 19, a large lifeboat 20 can be safely and smoothly lowered from the drilling platform / drilling ship 22 to the sea surface or lifted from the sea surface to a lifeboat parking place, the hoisting winch 1, the telescopic arms and a remote control device 21 being connected, the remote control device 21 being arranged on the lifeboat 20, the remote control device 21 being used for controlling the hoisting winch 1 to retract and extend the hoisting wire rope 2 and controlling the telescopic arms to extend and retract.

[0029] As shown in Figure 3 and 4 , each telescopic arm comprises an outer support frame 4, one end of the outer support frame 4 being connected with the side of the drilling platform / drilling ship 22, the inner wall of the outer support frame 4 being slidably connected with a primary telescopic arm 15, the inner wall of the primary telescopic arm 15 being slidably connected with a secondary telescopic arm 18;

[0030] Further comprising a telescopic hydraulic cylinder 7, one end of the telescopic hydraulic cylinder 7 being connected with the bottom of the outer support frame 4, the other end of the telescopic hydraulic cylinder 7 being connected with the bottom of the primary telescopic arm 15, the telescopic hydraulic cylinder 7 being connected with the remote control device 21 to control the extension and retraction of the telescopic hydraulic cylinder 7.

[0031] The top of the primary telescopic arm 15 and away from the drilling platform / drilling ship 22 one end is provided with an extension wire rope guide wheel 13, the extension wire rope 12 is wound on the extension wire rope guide wheel 13, one end of the extension wire rope 12 is connected with the top of the outer support frame 4, the other end of the extension wire rope 12 is connected with the top of the secondary telescopic arm 18 and close to the drilling platform / drilling ship 22 one end;

[0032] The top of the primary telescopic arm 15 and close to the drilling platform / drilling ship 22 one end is provided with a retracting wire rope guide wheel 9, the retracting wire rope 10 is wound on the retracting wire rope guide wheel 9, one end of the retracting wire rope 10 is connected with the top of the outer support frame 4 and away from the drilling platform / drilling ship 22 one end, the other end of the retracting wire rope 10 is connected with the top of the secondary telescopic arm 18 and close to the drilling platform / drilling ship 22 one end.

[0033] As shown in Figure 3 , one end of the telescopic hydraulic cylinder 7 is connected with the telescopic hydraulic cylinder connecting ear plate I 8 arranged at the bottom of the outer support frame 4 through a pin shaft, the other end of the telescopic hydraulic cylinder 7 is connected with the telescopic hydraulic cylinder connecting ear plate II 16 arranged at the bottom of the primary telescopic arm 15 through a pin shaft.

[0034] As shown in Figure 5 and 6 , one end of the extension wire rope 12 is connected with the extension wire rope rope end connecting ear plate 6 arranged at the top of the outer support frame 4, the other end of the extension wire rope 12 is connected with the extension wire rope rope head connecting ear plate 14 arranged at the top of the secondary telescopic arm 18.

[0035] One end of the retracting wire rope 10 is connected with the retracting wire rope rope end connecting ear plate 5 arranged at the top of the outer support frame 4, the other end of the retracting wire rope 10 is connected with the retracting wire rope rope head connecting ear plate 11 arranged at the top of the secondary telescopic arm 18.

[0036] When the telescopic hydraulic cylinder 7 pushes the primary telescopic arm 15 to extend in the outer support frame 4, the extension wire rope guide wheel 13 extends with the primary telescopic arm 15, the extension wire rope 12 bears tension and pulls the extension wire rope rope head connecting ear plate 14 on the secondary telescopic arm 18 to the outboard side, thereby pulling the secondary telescopic arm 18 to extend, in this process, the retracting wire rope 10 is in tension but not under force. When the telescopic hydraulic cylinder 7 pulls the primary telescopic arm 15 to retract in the outer support frame 4, the retracting wire rope guide wheel 9 retracts with the primary telescopic arm 15, the retracting wire rope 10 bears tension and pulls the retracting wire rope rope head connecting ear plate 11 on the secondary telescopic arm 18 to the inboard side, thereby pulling the secondary telescopic arm 18 to retract, in this process, the extension wire rope 12 is in tension but not under force.

[0037] As shown in Figure 3As shown, one end of the lifting wire rope 2 is connected with the lifting winch 1 through several lifting wire rope guide pulleys I 3 arranged near one end of the outer support frame 4 close to the drilling platform / drilling ship 22, the lifting wire rope 2 passes through the outer support frame 4, the first telescopic arm 15 and the second telescopic arm 18 in sequence, the other end of the lifting wire rope 2 is connected with the lifting wire rope connecting lug 17 through two lifting wire rope guide pulleys II 23 arranged near the other end of the second telescopic arm 18 away from the drilling platform / drilling ship 22, the part of the lifting wire rope 2 between the two lifting wire rope guide pulleys II 23 is wound with the lifting pulley 19, the bottom of the lifting pulley 19 is provided with a lifting hook, the lifting hook is connected with the lifting hanging point of the lifeboat 20, the lifting wire rope connecting lug 17 is connected with the second telescopic arm 18, the lifting wire ropes 2 on the two telescopic arms are connected with the same lifting winch 1, so that the synchronism of the two lifting pulleys 19 on the outer ends of the two telescopic arms when the lifeboat 20 is lifted and placed is ensured.

[0038] As shown in Figure 7 and Figure 8 As shown, the two inner side walls of the outer support frame 4 are provided with sliding channels I, the two outer side walls of the first telescopic arm 15 are provided with sliding blocks I arranged in the sliding channels I, the two inner side walls of the first telescopic arm 15 are provided with sliding channels II, and the two outer side walls of the second telescopic arm 18 are provided with sliding blocks II arranged in the sliding channels II.

[0039] Embodiment 1

[0040] The present application provides a double telescopic arm type lifeboat lifting device, which comprises two symmetrically arranged telescopic arms, one end of each telescopic arm is connected with the side of the drilling platform / drilling ship 22, the length direction central axes of the two telescopic arms are perpendicular to the side of the drilling platform / drilling ship 22, each telescopic arm is provided with a lifting wire rope 2, one end of the lifting wire rope 2 is connected with a lifting winch 1 arranged on the drilling platform / drilling ship 22, the other end of the lifting wire rope 2 is connected with the end of the telescopic arm away from the drilling platform / drilling ship 22 through a lifting pulley 19, the bottom of the lifting pulley 19 is provided with a lifting hook, and the two telescopic arms are respectively used for suspending the lifting hanging points of the bow and the stern of the lifeboat 20; through the synchronous telescoping of the two telescopic arms and the lifting and placing of the lifting pulley 19, a large lifeboat 20 can be safely and stably lowered from the drilling platform / drilling ship 22 to the sea surface or lifted from the sea surface to the lifeboat parking place.

[0041] Each telescopic arm comprises an outer support frame 4, one end of the outer support frame 4 is connected with the side of the drilling platform / drilling ship 22, the two inner side walls of the outer support frame 4 are provided with sliding channels I, the two outer side walls of the first telescopic arm 15 are provided with sliding blocks I arranged in the sliding channels I, the two inner side walls of the first telescopic arm 15 are provided with sliding channels II, and the two outer side walls of the second telescopic arm 18 are provided with sliding blocks II arranged in the sliding channels II.

[0042] The telescopic hydraulic cylinder 7 is connected to the bottom of the outer support frame 4 at one end and connected to the bottom of the first telescopic arm 15 at the other end.

[0043] The top of the first telescopic arm 15 and away from the drilling platform / drilling ship 22 is provided with an extension wire rope guide wheel 13, and the extension wire rope 12 is wound on the extension wire rope guide wheel 13. One end of the extension wire rope 12 is connected to the top of the outer support frame 4, and the other end of the extension wire rope 12 is connected to the top of the second telescopic arm 18 and close to the drilling platform / drilling ship 22.

[0044] The top of the first telescopic arm 15 and close to the drilling platform / drilling ship 22 is provided with a retracting wire rope guide wheel 9, and the retracting wire rope 10 is wound on the retracting wire rope guide wheel 9. One end of the retracting wire rope 10 is connected to the top of the outer support frame 4 and away from the drilling platform / drilling ship 22, and the other end of the retracting wire rope 10 is connected to the top of the second telescopic arm 18 and close to the drilling platform / drilling ship 22.

[0045] Example 2

[0046] The difference from example 1 is that one end of the extension wire rope 12 is a screw rod structure, and then the screw rod passes through the extension wire rope end connecting ear plate 6 arranged on the top of the outer support frame 4, and a nut is installed on the outer end of the screw rod and tightened. The other end of the extension wire rope 12 is an ear plate structure, which is connected to the extension wire rope head connecting ear plate 14 arranged on the top of the second telescopic arm 18 through a pin shaft.

[0047] One end of the retracting wire rope 10 is a screw rod structure, and then the screw rod passes through the retracting wire rope end connecting ear plate 5 arranged on the top of the outer support frame 4, and a nut is installed on the outer end of the screw rod and tightened. The other end of the retracting wire rope 10 is an ear plate structure, which is connected to the retracting wire rope head connecting ear plate 11 arranged on the top of the second telescopic arm 18 through a pin shaft.

[0048] Example 3

[0049] The difference from the embodiment 1 is that one end of the lifting wire rope 2 is connected with the lifting winch 1 by passing through several lifting wire rope guide pulleys I 3 arranged at the end of the outer support frame 4 close to the drilling platform / drilling ship 22, the lifting wire rope 2 passes through the outer support frame 4, the primary telescopic arm 15 and the secondary telescopic arm 18 in sequence, the other end of the lifting wire rope 2 is connected with the lifting wire rope connecting lug 17 through two lifting wire rope guide pulleys II 23 arranged at the end of the secondary telescopic arm 18 away from the drilling platform / drilling ship 22, the part of the lifting wire rope 2 between the two lifting wire rope guide pulleys II 23 is wound with the lifting pulley 19, the bottom of the lifting pulley 19 is provided with a hook, and the lifting wire rope connecting lug 17 is connected with the secondary telescopic arm 18.

[0050] Embodiment 4

[0051] The difference from the embodiment 1 is that one end of the telescopic hydraulic cylinder 7 is connected with the telescopic hydraulic cylinder connecting lug I 8 arranged at the bottom of the outer support frame 4 through a pin shaft, and the other end of the telescopic hydraulic cylinder 7 is connected with the telescopic hydraulic cylinder connecting lug II 16 arranged at the bottom of the primary telescopic arm 15 through a pin shaft.

[0052] The working principle of the double telescopic boom type lifeboat hoisting device is as follows:

[0053] The double telescopic boom type lifeboat hoisting device is lowered as follows:

[0054] When the lifeboat needs to be lowered, the escape personnel enter the lifeboat 20 through the quick passage of the drilling platform / drilling ship 22, control the telescopic hydraulic cylinder 7 to extend by operating the remote control device 21 installed in the lifeboat 20, and control the double drum of the lifting winch 1 to slowly release the rope. With the gradual extension of the telescopic hydraulic cylinder 7, the primary telescopic arm 15 is stably extended along the outer support frame 4, and the extension steel wire rope 12 is pulled to the outboard side of the lifeboat due to the internal force, thereby pulling the extension steel wire rope rope head connecting lug 14 on the secondary telescopic arm 18, and driving the secondary telescopic arm 18 to extend. When the telescopic hydraulic cylinder 7 is extended to the limit position, the primary telescopic arm 15 and the secondary telescopic arm 18 are also extended to the limit, the lifeboat 20 gradually reaches the outboard side position away from the drilling platform / drilling ship 22 along with the extension of the primary telescopic arm 15 and the secondary telescopic arm 18 and the release of the rope of the lifting winch 1, the control of the telescopic hydraulic cylinder 7 by the remote control device 21 is stopped, and thus the horizontal extension of the double telescopic boom type lifeboat hoisting device is completed. After the horizontal extension is completed, the double drum of the lifting winch 1 continues to release the rope by operating the remote control device 21 in the lifeboat 20, and the lifting pulley 19 hangs the lifeboat 20 to the sea level target area by relying on the gravity of the lifeboat 20. The connection between the lifeboat 20 and the lifting pulley 19 is disconnected, the lifeboat 20 is started, and is quickly withdrawn to a safe area, and thus the lifeboat hoisting is completed.

[0055] The steps of recovering the double telescopic davit lifeboat davit are the reverse of the above lowering steps.

Claims

1. A double telescopic davit lifeboat launching arrangement, characterised in that, The device comprises two symmetrically arranged telescopic arms, one end of each of the telescopic arms is connected with the side of a drilling platform / drilling ship (22), a lifting steel wire rope (2) is arranged on each of the telescopic arms, one end of the lifting steel wire rope (2) is connected with a lifting winch (1), the lifting winch (1) is arranged on the drilling platform / drilling ship (22), the other end of the lifting steel wire rope (2) is connected with one end of the telescopic arm away from the drilling platform / drilling ship (22) through a lifting pulley (19); Each of the telescopic arms comprises an outer support frame (4), one end of the outer support frame (4) is connected with the side of the drilling platform / drilling ship (22), the inner wall of the outer support frame (4) is slidably connected with a first telescopic arm (15), the inner wall of the first telescopic arm (15) is slidably connected with a second telescopic arm (18); The device further comprises a telescopic hydraulic cylinder (7), one end of the telescopic hydraulic cylinder (7) is connected with the bottom of the outer support frame (4), the other end of the telescopic hydraulic cylinder (7) is connected with the bottom of the first telescopic arm (15); The top of the first telescopic arm (15) and one end away from the drilling platform / drilling ship (22) is provided with an extension steel wire rope guide wheel (13), the extension steel wire rope (12) is wound on the extension steel wire rope guide wheel (13), one end of the extension steel wire rope (12) is connected with the top of the outer support frame (4), the other end of the extension steel wire rope (12) is connected with the top of the second telescopic arm (18) and one end close to the drilling platform / drilling ship (22); The top of the first telescopic arm (15) and one end close to the drilling platform / drilling ship (22) is provided with a retraction steel wire rope guide wheel (9), the retraction steel wire rope (10) is wound on the retraction steel wire rope guide wheel (9), one end of the retraction steel wire rope (10) is connected with the top of the outer support frame (4) and one end away from the drilling platform / drilling ship (22), the other end of the retraction steel wire rope (10) is connected with the top of the second telescopic arm (18) and one end close to the drilling platform / drilling ship (22); One end of the telescopic hydraulic cylinder (7) is connected with a telescopic hydraulic cylinder connecting ear plate I (8) arranged at the bottom of the outer support frame (4) through a pin shaft, the other end of the telescopic hydraulic cylinder (7) is connected with a telescopic hydraulic cylinder connecting ear plate II (16) arranged at the bottom of the first telescopic arm (15) through a pin shaft; One end of the extension steel wire rope (12) is connected with an extension steel wire rope rope end connecting ear plate (6) arranged at the top of the outer support frame (4), the other end of the extension steel wire rope (12) is connected with an extension steel wire rope rope head connecting ear plate (14) arranged at the top of the second telescopic arm (18).

2. A twin telescopic boom lifeboat davit according to claim 1, characterised in that, One end of the retraction steel wire rope (10) is connected with a retraction steel wire rope rope end connecting ear plate (5) arranged at the top of the outer support frame (4), the other end of the retraction steel wire rope (10) is connected with a retraction steel wire rope rope head connecting ear plate (11) arranged at the top of the second telescopic arm (18).

3. The dual telescoping boom life raft davit of claim 1, wherein, One end of the lifting steel wire rope (2) is connected with the lifting winch (1) by winding around several lifting steel wire rope guide pulleys I (3) arranged on the outer support frame (4) near the end of the drilling platform / drilling ship (22), the lifting steel wire rope (2) passes through the outer support frame (4), the first telescopic arm (15), and the second telescopic arm (18) in sequence, the other end of the lifting steel wire rope (2) is connected with the lifting steel wire rope connecting lug plate (17) by winding around two lifting steel wire rope guide pulleys II (23) arranged on the second telescopic arm (18) away from the end of the drilling platform / drilling ship (22), and the lifting steel wire rope connecting lug plate (17) is connected with the second telescopic arm (18).

4. The dual telescoping boom life raft davit of claim 1, wherein, The part of the lifting steel wire rope (2) between the two lifting steel wire rope guide pulleys II (23) is wound with a lifting pulley (19), and the bottom of the lifting pulley (19) is provided with a lifting hook.

5. The dual telescoping boom life raft davit of claim 1, wherein, The outer support frame (4) is provided with a sliding groove I on the inner side wall, the first telescopic arm (15) is provided with a sliding block I on the outer side wall, the sliding block I is arranged in the sliding groove I, the first telescopic arm (15) is provided with a sliding groove II on the inner side wall, and the second telescopic arm (18) is provided with a sliding block II on the outer side wall, the sliding block II is arranged in the sliding groove II.

6. The dual telescoping boom life raft davit of claim 1, wherein, The length direction central axes of the two telescopic arms are perpendicular to the side of the drilling platform / drilling ship (22).

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